CVE-2026-7168

MEDIUM

curl - Authentication Bypass via Proxy-Authorization Header Reuse

Title source: llm

Description

Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.

References (4)

Core 4

Core References

json

https://curl.se/docs/CVE-2026-7168.json

www

https://curl.se/docs/CVE-2026-7168.html

issue

https://hackerone.com/reports/3697719

Mailing List

http://www.openwall.com/lists/oss-security/2026/04/29/14

Scores

CVSS v3 5.3

EPSS 0.0008

EPSS Percentile 23.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-294

Status published

Products (50)

curl/curl 7.12.0

curl/curl 7.12.1

curl/curl 7.12.2

curl/curl 7.12.3

curl/curl 7.13.0

curl/curl 7.13.1

curl/curl 7.13.2

curl/curl 7.14.0

curl/curl 7.14.1

curl/curl 7.15.0

... and 40 more

Published May 13, 2026

Tracked Since May 13, 2026